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Ecological RationalityIntelligence in the World$
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Peter M. Todd and Gerd Gigerenzer

Print publication date: 2012

Print ISBN-13: 9780195315448

Published to Oxford Scholarship Online: May 2012

DOI: 10.1093/acprof:oso/9780195315448.001.0001

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How Groups Use Partial Ignorance to Make Good Decisions

How Groups Use Partial Ignorance to Make Good Decisions

Chapter:
7 How Groups Use Partial Ignorance to Make Good Decisions
Source:
Ecological Rationality
Author(s):

Konstantinos V. Katsikopoulos

Torsten Reimer

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195315448.003.0050

Is prior recognition of decision options used when a group of people tries to decide together which option to choose? And if it is used, how does it affect group performance? To find out, mathematical models of majority and lexicographic decision making were developed using different assumptions about how groups use recognition information. Based on the models, precise predictions were made for when the less-is-more effect (where less information leads to more accuracy) would occur in groups. The psychological plausibility of the models was also tested with groups of three people. Experimental results indicate that (a) members who can use the recognition heuristic are—in most but not all cases—more influential in the group decision process than members who cannot use the heuristic, and (b) the less-is-more effect can occur at the group level.

Keywords:   Condorcet jury theorem, consensus, less-is-more effect, lexicographic strategy, majority rule, group decision making, recognition heuristic

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